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Node Editor - invisible and disappering connections
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Description

System Information
Operating system: Windows-10-10.0.18362 64 Bits
Graphics card: GeForce RTX 2080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 430.86

Blender Version
Broken: version: 2.81 (sub 12), branch: master, commit date: 2019-09-25 20:42, hash: rBee4707544904
Worked: (optional)
2.80

Short description of error
[Please fill out a short description of the error here]
In Node Editor there is a problem with connection lines: they are not shown or disappear when reconnecting other nodes

Exact steps for others to reproduce the error
[Please describe the exact steps needed to reproduce the issue]
[Based on the default startup or an attached .blend file (as simple as possible)]

This problem appears when Blender uses non-default user startup file, as I have investigated so far.
Cause even after Load defaults then Save config and reopen Blender ( it starts with my startup file ) does not solve this problem.
I think that is something not right if user have to rebuild his workplace from scratch every time when software is updated.
Please investigate this case. Thank you.

Details

Type
Bug

Event Timeline

I would like to add that the physical connection is active.
Just the line disappears and is not displayed. But connection works.
If you will try disconnect that "invisible" wire then you will see this wire partially disconnected and sicked to the cursor as should be ( but when connecting nodes was invisible)